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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0dca86977f5796084a35fa0ead2c4c3ccf60c0fef170a519dfacd8d528a98f59' 
  AND token = 'BSjV0HyjhifSXqRG50kt/udcIve49nOpaE8xBEnHyJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}